Skip to content
Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

non-maximum suppression

Thinning a gradient-magnitude image to single-pixel width by keeping only local maxima along the gradient direction.

Non-maximum suppression keeps a pixel only if its magnitude is greater than or equal to both of its neighbors along the local gradient direction, zeroing every other pixel -- thinning a multi-pixel-wide response to a single-pixel ridge.

See also

Canny edge detector
Read the full section →
Graph settings

Calculator